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Dr. Nathaniel C. Warner, MD

Internal Medicine (Internal Medicine Physician)

  • Medicare participating

At a glance

Years since graduation
13
In the NPI registry since
2013
Medicare patients seen, 2024
132

The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. What an NPI is

Education and training

  • 2013Registered with an NPI (national billing number; not a license date)

Medicare’s Care Compare data doesn’t list this clinician’s medical school. Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).

Specialties and state licenses

  • Internal Medicine Physician primary
    VA license 0101260708
  • Critical Care Medicine (Internal Medicine) Physician
    VA license 0101260708
  • Infectious Disease Physician
    VA license 0101260708

As reported to the NPI registry. To confirm a license is current, check the state medical board.

Map: Internal Medicine per capita by county →

Where they work

Hospitals

Medical groups

Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.

Medicare patients and services

Medicare patients, 2024
132
Services billed
269
Patients’ average age
68
Most frequent Medicare services, 2023
ServiceTimesPatients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes7941
Established patient office or other outpatient visit, 40-54 minutes4630
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes2828
Established patient office or other outpatient visit, 30-39 minutes1312

Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.

Medicare prescriptions

Most prescribed drugs, Medicare Part D 2024
DrugPrescriptions
Biktarvy (bictegrav/emtricit/tenofov ala)63
Azithromycin
Other prescribers in Richmond, VA
50
Ethambutol Hcl31
Voriconazole27
Imipenem-Cilastatin Sodium (imipenem/cilastatin sodium)25
Cephalexin
Other prescribers in Richmond, VA
20
Pifeltro (doravirine)19
Sulfamethoxazole-Trimethoprim (sulfamethoxazole/trimethoprim)
Other prescribers in Richmond, VA
17
Dovato (dolutegravir sodium/lamivudine)17
Methenamine Hippurate
Other prescribers in Richmond, VA
16

Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.

Other Internal Medicine clinicians in Richmond

Sources

NPI registry (CMS NPPES, November 2026; record last updated June 30, 2026), Medicare Care Compare, Medicare Physician & Other Practitioners (2024), Medicare Part D Prescribers (2024) and Open Payments (2025). Information is self-reported or billed data and may be out of date; call before visiting.

NPI 1174969794. Official NPI registry record (opens in a new tab). Clinicians can correct their information in NPPES; changes appear here after our next monthly update.